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Electronics for Radio Surveillance & Monitoring - SIGINT/COMINT

Military - Government - Commercial

Receive Filters Bias-Tee Accessories




Receive Filters

Bias-Tee, RF Limiters


Multicouplers Pre-Amplifiers

Made In USA

General Specifications

RF Insertion Loss:   < 1 dB @ 500 MHz
Frequency Range:  25 MHz to 1.5 GHz (BNC/TNC)
Frequency Range:   25 MHz to 2.5 GHz (N-type connectors)
Return Loss:   > 20 dB
Impedance:   50 Ohms (In/Out)
Connectors:  BNC (female)
Optional Connectors:  N-Type (female), TNC, SMA
DC Pass Voltage:  50 Volts (max)
DC Pass Current: 450 mA (max)
Enclosure: Cast Aluminum with black powder coating (standard)
DC Power Jack:  5.5mm/2.1mm (matching plug supplied)
DC Power Jack, Option 1:  BNC connector
DC Power connection, Option 2:  EMI/RFI Ceramic Feed-thru.


Bias-Tee  -  25 MHz to 2 GHz  (DC Inserter)

Stridsberg Engineering, LLC.  -   Shreveport, Louisiana, USA - (318) 861-0660

T4010 is a broad-band high performance “Bias-Tee”. It is design to supply DC power to a remote device such as a head-end pre-amplifier via the coaxial cable

This Bias-Tee (also known as a DC Inserter) features micro-strip line construction with select components to enhance the broad-band performance in the VHF/UHF frequency range.

This unit may be used with any remote device that was designed to receive DC operating power via a coaxial cable. It is housed in a cast aluminum case for ruggedness and high reliability.

BNC connectors are standard, with N and TNC connectors optional.

DC power (Positive or Negative polarity) is applied to the DC jack via a standard 5.5mm/2.1mm plug, a  6 foot power cord is supplied. For hard wired dc connection an EMI/RFI ceramic feed-thru with ground lug is available.

Connector Options

Purchase Bias-Tee below


RF Power Limiter - 500 kHz to 2 GHz

OUTPUT POWER dBm 20 15 10 5 0 -5 -10 -15 10 0 -5 -10 -15 5 15 20 25 30 35 INPUT POWER dBm 40

RF power limiting range

General Specifications

Insertion Loss:   < 0.3 dB @ 500 MHz
Frequency Range:  500 kHz to 2 GHz
Return Loss:   > 15 dB
Impedance:   50 Ohms (In/Out)
Connectors:  BNC (female)
Optional Connectors:  N-Type (female), TNC, SMA
Maximum sustained RF power:  > 35 dBm
Limiting RF levels: 10 to 13 dBm
DC Blocked
Enclosure: Cast Aluminum with black powder coating (standard)

LIM-01WB is a RF power protection device designed to prevent large and damaging RF power levels destroy sensitive receiving equipment such as multicouplers, pre-amplifiers and scanning receivers, specifically those devices installed in proximity to transmit antennas.

It also provide additional protection from electrostatic discharge (ESD) introduced on to the antenna system originating from wind driven ESD build-up and to those ESD from nearby lightning storms. However, it is not a Lightening Protection Device and can not withstand direct lightening hits.

In its linear region, insertion loss (IL) is less than 0.3 dB over its broad frequency range and respond in about 10 nsec. to incident ESD events.
The LIM-01WB is typically connected in the antenna feed-line ahead of the device to be protected, multcouplers, receivers, preamplifiers, etc.

LIM-01WB is available in several connector choices, BNC, N, TNC and SMA

Purchase LIM-01WB below

December 2020

RF Power Limiter


HF, VHF/UHF Antenna

Application example


RF Power Limiter



HF, VHF/UHF Antenna

Connector Options

LIM-01WB Limiting response